How can a photographer’s image-focused site gain PageRank?

How can a photographer’s image-focused site gain PageRank?

“How would a photographer gain any significant PageRank for his or her site when the subject that really matters—images—has no anchor text? Often, the photos alone will sell the photographer to his/her clients. How can we overcome this challenge?
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Land Lubber, Colorado

The stock photo websites operated by graphic designers/photographers or the image-focused websites (e.g. website for high-class restaurant) are mostly consisted with images. It is difficult for search engine to understand the purpose of those websites because search engine cannot understand the detail of images. Mr. Matt Cutts of Google provides some advises on this point.